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Finding the Fourth Proportional to 1,408.90, 1,944.20 and 819.42

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Solution

The fourth proportional to 1,408.90, 1,944.20 and 819.42 is: 1,130.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.90 : 1,944.20 = 819.42 : x
  2. Step 2: Convert to fraction form
    1,408.90/1,944.20 = 819.42/x
  3. Step 3: Cross multiply
    1,408.90x = 1,944.20 × 819.42
  4. Step 4: Simplify right side
    1,408.90x = 1,593,116.36
  5. Step 5: Solve for x
    x = 1,593,116.36/1,408.90
  6. Step 6: Final answer
    x = 1,130.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.